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TZID:Europe/Paris
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UID:0-1063@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20251010T140000
DTEND;TZID=Europe/Paris:20251010T153000
DTSTAMP:20251009T081820Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/informal-quantum-
 seminar-alexandre-fagerlund/
SUMMARY:Informal quantum seminar: Alexandre Fagerlund - Salle des séminair
 es du FAST et du LPTMS\, bâtiment Pascal n°530 - 10 Oct 25 14:00
DESCRIPTION:A holesome story: quasiholes and other surprises in the fractio
 nal quantum Hall effect\nAlexandre Fagerlund\n&nbsp\;\nThere is a wealth o
 f rich physics associated with the fractional quantum Hall effect. I will
  give an introduction to some of these ideas\, with a focus on the so-call
 ed k=3 Read-Rezayi state. The talk will assume only "an epsilon" of prere
 quisite knowledge\, and will gradually introduce some of the basic ideas 
 relevant for the fractional quantum Hall effect. These include some use
 ful wave functions and the notion of quasiholes\, which are quasiparticl
 e dips in the electron fluid. I will briefly outline how these concepts ca
 n be related to conformal field theory (CFT). The CFT description provides
  a different perspective on some of the quantum Hall phenomena\, and is ev
 entually shown to naturally lead to the language of matrix product states 
 (MPS)\, which can be used for efficient numerical computations for fractio
 nal quantum Hall states. \nIn the second part of the talk\, I will outlin
 e some of my own research. This includes a numerical technique developed 
 together with my supervisor\, Eddy Ardonne. The technique is based on CFT 
 and MPS\, and allows e.g. density profiles and spins of quasiholes in the
  k=3 Read-Rezayi state to be computed. From these spins\, braiding phases 
 of quasiholes can be inferred. Together with Leonardo Mazza and Alberto Na
 rdin\, we have also used these methods to numerically demonstrate a form o
 f bulk-boundary correspondence in fractional quantum Hall states\, where s
 pin fractionalizes between a quasihole in the bulk and the distorted edge.
  This topic will be subject to more research during my stay here.
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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TZID:Europe/Paris
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DTSTART:20250330T030000
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